var box=document.getElementById('box');
        var div=box.children[0];
        var arr=div.children;
        var height=div.children[0].offsetHeight;
        var num=0;
        function autoplay(){
            num++;
            if(num>arr.length-1){
                num=1;
                div.style.top=0;
            }
            move(div,'top',-num*height);    
        }
        var timer2=setInterval(autoplay,1000);
        box.onmouseenter=function(){
            clearInterval(timer2);
        }
        box.onmouseleave=function(){
            clearInterval(timer2);
            timer2=setInterval(autoplay,1000);
        }